Keeping it real: the magic of science

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In his new book Richard Dawkins teaches young and old the fundamentals of science. So, have you ever wondered...

...why are there so many animals?

Adam’s task of naming all the animals was a tough one. It’s been estimated
that about 2 million species have so far been given scientific names, and
even these are just a small fraction of the number of species yet to be
named. How do we even decide whether two animals belong in the same species
or in two different species? Where animals reproduce sexually, we can come
up with a sort of definition.

Animals belong to different species if they don’t breed together. There are
borderline cases, such as horses and donkeys, which can